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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration( /L <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW7 07/16/87 8 35 18 11 -976 000 78 35 32 679 1,000 -- <br /> 04/11/88 835 2121 -12 86 000 26 <2 0 10 <40 1,200 -- <br /> 8 35 Well dry since 07/12/88 <br /> 8 35 Not accessible since 12/30/93 <br /> 05/11/95 8 35 Well dry -- -- __ __ __ <br /> 08124195 8 35 Well dry <br /> 10/19/95 8 35 Well dry <br /> 02/13/96 835 Well dry <br /> 04/18/96 835 Well dry <br /> i <br /> 08/08/96 835 2160 -1325 000 <br /> 11/04/96 835 2250 -1415 000 -- -- -- -- -_ -- <br /> 02/03/97 835 1758 -923 000 <05 <05 <05 <05 71 <25 <br /> 05/08/97 6 85 1731 -1046 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/26/97 6 85 2009 -1324 000 -- -- -- -_ __ -- <br /> 11/11/97 685 Well dry -- -- -- -- __ -- <br /> 03/03/98 6 85 13 85 -700 000 <0 5 <0 5 <0 5 <0 5 79c <2 5 <br /> 03/03/98 6 85 <2 0* <br /> 05/20/98 6 85 13 98 -713 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/20/98 6 85 <2 0* <br /> 08/19/98 685 1543 -858 000 <05 <05 <05 <05 <50 <25 <br /> 08/19/98 6 85 <2 0* <br /> 11/18/98 685 1582 -897 000 <05 <05 <05 <05 <50 <25 <br /> 03/30/99 6 85 -- -- -- -- -- -- -- -- -- <br /> 05/05/99 6 85 1433 -748 000 <0 5 <0 S <0 S 0 637 542 <2 0 <br /> 08/20/99 6 85 1575 -890 000 -- -- -- -- -- -- <br /> 12/06/99 6 85 1597 -9 12 000 <1 <1 <1 <1 92 <1 <br /> g�tirojec1s1739421mas1er\wp%g60113942gw xis Page 13 of 46 <br />